Pub Date : 2013-05-15DOI: 10.1109/WPT.2013.6556869
Wei Wei, Y. Kawahara, T. Asami
We focused on a unique pattern of resonator, named double spiral resonator in WPT via resonance coupling, which is suitable for printing on ultra-thin and cheap substrates such as paper or film with ink-jet printing technology, concluding design trade-offs for the fabrication of double spiral resonator by investigating different structural parameters' effect on peak transmission efficiency. By conducting contrast experiments with other two patters of resonators, the fact that double spiral resonator ensured higher peak transmission efficiency in longer distance has been proved. Five structural parameters of double spiral resonator have been investigated on the effect of peak transmission efficiency. As well, equivalent circuit analysis on peak transmission efficiency has also been derived to inspect the theoretical explanation of the phenomenal parameters' effect on transmission efficiency.
{"title":"Experimental analysis of double spiral resonator for wireless power transmission","authors":"Wei Wei, Y. Kawahara, T. Asami","doi":"10.1109/WPT.2013.6556869","DOIUrl":"https://doi.org/10.1109/WPT.2013.6556869","url":null,"abstract":"We focused on a unique pattern of resonator, named double spiral resonator in WPT via resonance coupling, which is suitable for printing on ultra-thin and cheap substrates such as paper or film with ink-jet printing technology, concluding design trade-offs for the fabrication of double spiral resonator by investigating different structural parameters' effect on peak transmission efficiency. By conducting contrast experiments with other two patters of resonators, the fact that double spiral resonator ensured higher peak transmission efficiency in longer distance has been proved. Five structural parameters of double spiral resonator have been investigated on the effect of peak transmission efficiency. As well, equivalent circuit analysis on peak transmission efficiency has also been derived to inspect the theoretical explanation of the phenomenal parameters' effect on transmission efficiency.","PeriodicalId":143468,"journal":{"name":"2013 IEEE Wireless Power Transfer (WPT)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123909574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-05-15DOI: 10.1109/WPT.2013.6556868
O. Jonah, S. Georgakopoulos, M. Tentzeris
The efficiency of wireless power transfer (WPT) from an orientation insensitive system to a mobile device by strongly coupled magnetic resonance (SCMR) is reported here. This paper compares an optimal loop-based design in standard SCMR systems with misalignment insensitive system (3D and 3loop structure), which exhibits higher efficiency than typical SCMR devices in several directions in a sphere.
{"title":"Orientation insensitive power transfer by magnetic resonance for mobile devices","authors":"O. Jonah, S. Georgakopoulos, M. Tentzeris","doi":"10.1109/WPT.2013.6556868","DOIUrl":"https://doi.org/10.1109/WPT.2013.6556868","url":null,"abstract":"The efficiency of wireless power transfer (WPT) from an orientation insensitive system to a mobile device by strongly coupled magnetic resonance (SCMR) is reported here. This paper compares an optimal loop-based design in standard SCMR systems with misalignment insensitive system (3D and 3loop structure), which exhibits higher efficiency than typical SCMR devices in several directions in a sphere.","PeriodicalId":143468,"journal":{"name":"2013 IEEE Wireless Power Transfer (WPT)","volume":"272 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115598438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-05-15DOI: 10.1109/WPT.2013.6556923
Minfan Fu, Tong Zhang, Xinen Zhu, Chengbin Ma
A 13.56 MHz wireless power transfer (WPT) system is analyzed and implemented in this paper. This system consists of five subsystems: a class-D power amplifier, a pair of resonant coils, a rectifier, a DC/DC converter and various loads. By analyzing the transfer characteristics of the resonant coils, an optimum impedance is derived in order to minimize the power reflection. This impedance requirement is fulfilled by designing the rectifier and the DC/DC converter properly. The power reflection due to impedance mismatch can be controlled at 5%. When the load is a resistor, the system efficiency can reach 73% . When the loads are batteries or supercapacitors, the system efficiency can reach 66%.
{"title":"A 13.56 MHz wireless power transfer system without impedance matching networks","authors":"Minfan Fu, Tong Zhang, Xinen Zhu, Chengbin Ma","doi":"10.1109/WPT.2013.6556923","DOIUrl":"https://doi.org/10.1109/WPT.2013.6556923","url":null,"abstract":"A 13.56 MHz wireless power transfer (WPT) system is analyzed and implemented in this paper. This system consists of five subsystems: a class-D power amplifier, a pair of resonant coils, a rectifier, a DC/DC converter and various loads. By analyzing the transfer characteristics of the resonant coils, an optimum impedance is derived in order to minimize the power reflection. This impedance requirement is fulfilled by designing the rectifier and the DC/DC converter properly. The power reflection due to impedance mismatch can be controlled at 5%. When the load is a resistor, the system efficiency can reach 73% . When the loads are batteries or supercapacitors, the system efficiency can reach 66%.","PeriodicalId":143468,"journal":{"name":"2013 IEEE Wireless Power Transfer (WPT)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124743228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-05-15DOI: 10.1109/WPT.2013.6556884
A. Costanzo, M. Dionigi, F. Mastri, M. Mongiardo
Resonant Wireless Power Transfer over variable distances requires adaptive frequency change in order to preserve efficiency. The Royer oscillator provides the capability of correctly tracking the most efficient resonant frequency without the need of cumbersome control systems. In this paper, a rigorous modeling, including frequency-dependent losses, of a wireless power transfer system based on Royer oscillators is presented and experimentally verified.
{"title":"Rigorous modeling of mid-range wireless power transfer systems based on royer oscillators","authors":"A. Costanzo, M. Dionigi, F. Mastri, M. Mongiardo","doi":"10.1109/WPT.2013.6556884","DOIUrl":"https://doi.org/10.1109/WPT.2013.6556884","url":null,"abstract":"Resonant Wireless Power Transfer over variable distances requires adaptive frequency change in order to preserve efficiency. The Royer oscillator provides the capability of correctly tracking the most efficient resonant frequency without the need of cumbersome control systems. In this paper, a rigorous modeling, including frequency-dependent losses, of a wireless power transfer system based on Royer oscillators is presented and experimentally verified.","PeriodicalId":143468,"journal":{"name":"2013 IEEE Wireless Power Transfer (WPT)","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126176057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-05-15DOI: 10.1109/WPT.2013.6556928
T. Ohira
This paper proposes a non-magnetic non-resonant wireless power transfer scheme to vehicles during in motion, which is called via-wheel power transfer or V-WPT. We focus on the steel belt usually built in a tire for vehicles. It can collect RF displacement current if another electrode is buried beneath the road by analogy to an overhead wire for railways or trolleys. Since the tire always surely touches the road surface, it could be an ultimate wireless power transfer scheme. Being free from air gap (zero-gap coupling) unlike the twin coils, high dielectric constant of the tire permits high efficiency displacement current with much less electromagnetic field leakage to outside than trans-air-gap approaches. V-WPT can power the vehicles even while running, extend the cruising range without regard to battery limitations, and be the finest solution for future green mobility.
{"title":"Via-wheel power transfer to vehicles in motion","authors":"T. Ohira","doi":"10.1109/WPT.2013.6556928","DOIUrl":"https://doi.org/10.1109/WPT.2013.6556928","url":null,"abstract":"This paper proposes a non-magnetic non-resonant wireless power transfer scheme to vehicles during in motion, which is called via-wheel power transfer or V-WPT. We focus on the steel belt usually built in a tire for vehicles. It can collect RF displacement current if another electrode is buried beneath the road by analogy to an overhead wire for railways or trolleys. Since the tire always surely touches the road surface, it could be an ultimate wireless power transfer scheme. Being free from air gap (zero-gap coupling) unlike the twin coils, high dielectric constant of the tire permits high efficiency displacement current with much less electromagnetic field leakage to outside than trans-air-gap approaches. V-WPT can power the vehicles even while running, extend the cruising range without regard to battery limitations, and be the finest solution for future green mobility.","PeriodicalId":143468,"journal":{"name":"2013 IEEE Wireless Power Transfer (WPT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130695108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-05-15DOI: 10.1109/WPT.2013.6556913
A. Takacs, H. Aubert, L. Despoisse, S. Fredon
This paper addresses the microwave energy harvesting for powering wireless sensors on board of geostationary satellites. The electromagnetic environment existing on such satellites is first investigated and experimental results in K-band demonstrate for the first time the feasibility of such energy harvesting in satellite applications for powering autonomous wireless sensors. Experimental results demonstrates that a DC voltage up to 4.5 V and a DC power up to 2.25 mW can be harvested on board of geostationary satellites by using a simple rectenna topology.
{"title":"Design and implementation of a rectenna for satellite application","authors":"A. Takacs, H. Aubert, L. Despoisse, S. Fredon","doi":"10.1109/WPT.2013.6556913","DOIUrl":"https://doi.org/10.1109/WPT.2013.6556913","url":null,"abstract":"This paper addresses the microwave energy harvesting for powering wireless sensors on board of geostationary satellites. The electromagnetic environment existing on such satellites is first investigated and experimental results in K-band demonstrate for the first time the feasibility of such energy harvesting in satellite applications for powering autonomous wireless sensors. Experimental results demonstrates that a DC voltage up to 4.5 V and a DC power up to 2.25 mW can be harvested on board of geostationary satellites by using a simple rectenna topology.","PeriodicalId":143468,"journal":{"name":"2013 IEEE Wireless Power Transfer (WPT)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115654770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-05-15DOI: 10.1109/WPT.2013.6556871
M. Dionigi, G. Franceschetti, M. Mongiardo
Resonant Wireless Power Transfer is an emerging technique for exchanging energy in the near field. Common resonators take the form of splitted ring resonators, coils, spiral, or helical resonators. The radiating behaviors of coupled resonators are investigated in this paper and properties important for practical applications are illustrated. We show that the selection of the appropriate resonant frequency is important in order to obtain full power transmission and to avoid unwanted electromagnetic interference.
{"title":"Resonant Wireless Power Transfer: Investigation of radiating resonances","authors":"M. Dionigi, G. Franceschetti, M. Mongiardo","doi":"10.1109/WPT.2013.6556871","DOIUrl":"https://doi.org/10.1109/WPT.2013.6556871","url":null,"abstract":"Resonant Wireless Power Transfer is an emerging technique for exchanging energy in the near field. Common resonators take the form of splitted ring resonators, coils, spiral, or helical resonators. The radiating behaviors of coupled resonators are investigated in this paper and properties important for practical applications are illustrated. We show that the selection of the appropriate resonant frequency is important in order to obtain full power transmission and to avoid unwanted electromagnetic interference.","PeriodicalId":143468,"journal":{"name":"2013 IEEE Wireless Power Transfer (WPT)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116345745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-05-15DOI: 10.1109/WPT.2013.6556890
S. Scorcioni, L. Larcher, A. Bertacchini, L. Vincetti, M. Maini
A RF energy harvester comprised of an integrated differential RF-DC converter and a differential PCB custom antenna is presented for wireless powering applications in the UHF band. The RF-DC converter, based on a reconfigurable voltage rectifier directly connected to a matched PCB antenna, is designed for high efficiency and sensitivity. Prototypes of the RF-DC converter realized in CMOS 130nm technology show a -16dBm sensitivity and a 60% peak efficiency. The RF-DC converters operate within the -16dBm÷0dBm input power range with an efficiency which remains above the 40% for more than 10dB. The RF energy harvester operates on the 840MHz-975MHz band thanks to the ad-hoc designed wide-band differential antenna.
{"title":"An integrated RF energy harvester for UHF wireless powering applications","authors":"S. Scorcioni, L. Larcher, A. Bertacchini, L. Vincetti, M. Maini","doi":"10.1109/WPT.2013.6556890","DOIUrl":"https://doi.org/10.1109/WPT.2013.6556890","url":null,"abstract":"A RF energy harvester comprised of an integrated differential RF-DC converter and a differential PCB custom antenna is presented for wireless powering applications in the UHF band. The RF-DC converter, based on a reconfigurable voltage rectifier directly connected to a matched PCB antenna, is designed for high efficiency and sensitivity. Prototypes of the RF-DC converter realized in CMOS 130nm technology show a -16dBm sensitivity and a 60% peak efficiency. The RF-DC converters operate within the -16dBm÷0dBm input power range with an efficiency which remains above the 40% for more than 10dB. The RF energy harvester operates on the 840MHz-975MHz band thanks to the ad-hoc designed wide-band differential antenna.","PeriodicalId":143468,"journal":{"name":"2013 IEEE Wireless Power Transfer (WPT)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122428450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-05-15DOI: 10.1109/WPT.2013.6556876
Yazhou Dong, S. Dong, Ying Wang, Liming Gong
This paper presents a calibration method used to compensate channel amplitude and phase mismatch of the retrodirective antenna array for microwave power transmission. The calibration algorithm of N elements array antenna involves transmission of N time multiplexed orthogonal encoded signals. The received signals are coherently detected, accumulated in vector forms, and a set of correction factors are decoded from the received signal using the inverse of the encoded matrix. A Hadamard matrix is used as the encoding matrix. The demonstration of calibration method is carried out by simulation and analysis.
{"title":"Calibration method of retrodirective antenna array for microwave power transmission","authors":"Yazhou Dong, S. Dong, Ying Wang, Liming Gong","doi":"10.1109/WPT.2013.6556876","DOIUrl":"https://doi.org/10.1109/WPT.2013.6556876","url":null,"abstract":"This paper presents a calibration method used to compensate channel amplitude and phase mismatch of the retrodirective antenna array for microwave power transmission. The calibration algorithm of N elements array antenna involves transmission of N time multiplexed orthogonal encoded signals. The received signals are coherently detected, accumulated in vector forms, and a set of correction factors are decoded from the received signal using the inverse of the encoded matrix. A Hadamard matrix is used as the encoding matrix. The demonstration of calibration method is carried out by simulation and analysis.","PeriodicalId":143468,"journal":{"name":"2013 IEEE Wireless Power Transfer (WPT)","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122592199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-05-15DOI: 10.1109/WPT.2013.6556878
Tanvi Agrawal, P. K. Biswas, A. D. Raoot, Rohit Sharma
In passive Radio Frequency Identification (RFID) systems, tag collisions are more frequent due to lack of processing elements. Dynamic frame slotted ALOHA algorithms (DFSA) are popularly being used in passive RFID systems for collision avoidance. In DFSA based algorithms, selection of frame size has become a major research problem. Further nonoptimized frame size selection by reader may lead to energy consumption. In this paper a framework for optimum frame size evaluation has been proposed. This framework firstly achieves a condition for optimum frame size evaluation, and utilizes this value in new proposed DFSA algorithm. Proposed framework achieves a throughput of more than 35% along with lowest possible energy consumption by reader.
{"title":"Optimum frame size evaluation framework for efficient tag identification in passive RFID systems","authors":"Tanvi Agrawal, P. K. Biswas, A. D. Raoot, Rohit Sharma","doi":"10.1109/WPT.2013.6556878","DOIUrl":"https://doi.org/10.1109/WPT.2013.6556878","url":null,"abstract":"In passive Radio Frequency Identification (RFID) systems, tag collisions are more frequent due to lack of processing elements. Dynamic frame slotted ALOHA algorithms (DFSA) are popularly being used in passive RFID systems for collision avoidance. In DFSA based algorithms, selection of frame size has become a major research problem. Further nonoptimized frame size selection by reader may lead to energy consumption. In this paper a framework for optimum frame size evaluation has been proposed. This framework firstly achieves a condition for optimum frame size evaluation, and utilizes this value in new proposed DFSA algorithm. Proposed framework achieves a throughput of more than 35% along with lowest possible energy consumption by reader.","PeriodicalId":143468,"journal":{"name":"2013 IEEE Wireless Power Transfer (WPT)","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126044791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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